A person that hates everybody.
A sysadmin's skills are determined by his capacity to ignore time constraints and his attachment to bad faith. Additionally, a sysadmin usually believes anything with a higher level of abstraction than the C programming language is stupid.

Company: "Akshay, our email hasn't been working correctly for the past year. Can you please fix it?"
Sysadmin: "F*ck you! There is no way email is broken. I'll look at it tonight."

The troll that looks over the computers at your school/library/local bestbuy. He has no real power and solely relies on smoke and mirrors to intimidate students. His magical powers include psychic remote viewing (through VNC desktop viewer), sending popup messages through winpopup, remote restart/shutdown, locking up your desktop, and playing god. Skills involved in being a sysadmin include networking, hardware, and being an asshole.